RENNtech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980’s! Their experience, countless hours of in house research, development and exhaustive testing ensure that their proprietary ECU upgrade offers incredible performance gains and rock solid daily driver reliability.
RENNtech tuning software for Mercedes offers significant gains in horsepower and torque across the vehicles entire power band. By modifying ignition timing and throttle mapping, optimizing air/ fuel ratios, increasing the engines rev limiter and modifying boost mapping for turbo charged vehicles, RENNtech performance software unleashes your Mercedes true potential.
S 550 (W221) Stock Performance:
- 382 HP @ 6000 RPM; 391 LB-FT @ 2800-4800 RPM
- 402 HP @ 6000 RPM; 405 LB-FT @ 2800 RPM
- +20 HP / +14 LB-FT
*NOTE – We would need either the ECU or the vehicle bringing to our premises in Cheshire
Due to some of the products coming direct from RENNtech USA please allow 7-10 days for delivery
Prices may vary in accordance to the current exchange rate, please contact us for the current confirmed price